mineral

Polished/tumbled brown jasper or brecciated jasper

Microcrystalline quartz (SiO₂), commonly including hematite, iron oxides, and assorted silicified fragments

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, opaque to slightly translucent, brown-red with cream or gray patches, and a waxy to vitreous luster when wet or polished. It has cryptocrystalline quartz structure, no visible cleavage, and specific gravity around 2.5–2.7.

Identified August 14, 2026More mineral →

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At a glance

Common name: Polished/tumbled brown jasper or brecciated jasper
Scientific name: Microcrystalline quartz (SiO₂), commonly including hematite, iron oxides, and assorted silicified fragments
Category: mineral
Identified: August 14, 2026
Method: Standard

AI Estimated Value

About $2–$15 as a common tumbled stone; $20–$100+ for an attractive, patterned cabochon or collectible specimen.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic, sedimentary, or hydrothermal material; iron oxides create the reddish-brown coloration. Formation ages vary widely, from Precambrian to relatively young hydrothermal deposits.

Uses & applications

Used for beads, cabochons, carvings, tumblestones, paperweights, and ornamental objects; lesser-quality material has limited industrial value.

Geological facts

The image shows a water-wet, rounded specimen, so surface gloss exaggerates its polish and colors. Exact identification would require a dry examination and ideally a hardness or microscopic test.

Field identification & locations

Look for opaque, fine-grained texture, absence of cleavage, and resistance to scratching by steel; quartz-rich jasper should not be scratched by a knife. Common sources include India, Madagascar, Brazil, Australia, Mexico, and the western United States.